I am doing an e-commerce web site for a company selling e-Cigarettes and e-Liquid, the problem is how track availablity of items at the sub-option level.  For example, e-Liquid is sold flavour in three different size (main option level attibute), each size have a different price and weight.  Each flavour also has a different level of nicotine (sub-option level attribute), 0 mg, 3 mg, 6 mg, 8 mg, 12 mg, 18 mg and 24 mg and amount of nicotine has no bearing on the cost or weight.  Is it possible to track the quantities at the sub-option level, nicotine level?  The company has 8 Strawberry flavour 10 ml, 12 mg and 4 Strawberry flavour 30 ml, 8 mg, the fact that there are 12 Strawberry flavour without any idea of volume or nicotine level is meaningless.

So is the any way to track the items at the sub-option level?